Results 171 to 180 of about 4,167 (217)

Determination of travelling ionospheric disturbances

Journal of Atmospheric and Terrestrial Physics, 1978
A total of 35 days of Faraday rotation data was obtained from the ATS-6 radio beacon experiment operating with the closely spaced network of Elbert, Table Mountain, and Fort Morgan. The 140-MHz Faraday bandpass data are uncorrelated in the transmission range from 8 to 45 minutes. There are distinct, well correlated, and time-displaced maxima and minima
W. Degenhardt, G.K. Hartmann, K. Davies
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Frequency estimation of travelling ionospheric disturbances

1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96, 2002
The use of adaptive filters in estimating the instantaneous frequency of Doppler shifted signals reflected from the ionosphere is addressed in this paper. With the aid of a software simulator, it has been shown that an adaptive linear predictor is effective in extracting the required Doppler shift.
J.M. O'Keefe, D.A. Campbell, L.W. Cahill
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The dispersion of traveling ionospheric disturbances

Journal of Geophysical Research: Space Physics, 1983
The horizontal dispersion of relatively large daytime TID events seen by the Dartmouth rapid‐run ionosonde network is found to conform, at least qualitatively, to that predicted by previous theoretical treatments of freely propagating gravity waves in the presence of dissipation.
M. G. Morgan, B. L. Tedd
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Traveling ionospheric disturbances near London, Canada

Journal of Atmospheric and Solar-Terrestrial Physics, 2009
Abstract Observations of medium scale traveling ionospheric disturbances (TIDs) from near London, Canada (43°N, 81°W geographic) using spaced transmitter technique at 4 MHz have been done for 1 1 2 years. Most of the best data are for daytime TIDs because of the use of 4 MHz.
J.W. MacDougall, G. Li, P.T. Jayachandran   +2 more
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Travelling Disturbances in the Ionosphere

Nature, 1953
MEASUREMENTS of the horizontal velocity of travelling disturbances in the F2 region of the ionosphere have been made in this department over the past three years, using the method described by Munro1. Constant-frequency pulse transmitters were set up at the base station in the Physics Department of the University of Western Australia, and at two other ...
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GPS radio interferometry of travelling ionospheric disturbances

Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Abstract This paper presents some results investigating the new possibilities of radio interferometry of Travelling Ionospheric Disturbances (TIDs) that are based on exploiting standard measurements of transionospheric radio signal characteristics and coordinate-time measurements using dual-frequency multichannel receivers of the Global Positioning ...
E.L. Afraimovich, K.S. Palamartchouk, N.P. Perevalova   +2 more
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On the Relationship Between Traveling Atmospheric Disturbances and Traveling Ionospheric Disturbances

Journal of Geophysical Research: Space Physics
AbstractAs the typical thermospheric/ionospheric wave, traveling atmospheric disturbances (TADs)/traveling ionospheric disturbances (TIDs) always carry and transfer a large amount of energy and momentum during geomagnetic storms. In this study, we conducted a model simulation to explore the relationship between TADs and TIDs.
Bowei Liu, Jing Liu, Xuanqing Liu, Shuhan Li, Libo Liu   +4 more
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Travelling disturbances in the ionosphere

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1950
Methods have been developed for the examination of the horizontal and vertical movements of short-period disturbances in the ionosphere. It has been found that quasi-periodic travelling disturbances with periods of from 10 to 60 min. are of frequent occurrence in the F region by day.
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Travelling disturbances associated with ionospheric storms

Journal of Atmospheric and Terrestrial Physics, 1965
Following each of three geomagnetic sudden commencements, ionospheric disturbances (ionospheric storms) are found to propagate from two isolated locations in high-latitude regions of the Earth. These two positions are conjugate points (magnetically), and are in different locations for each magnetic storm.
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